TABLE OF CONTENTS The functions described below are from the MATLAB Wavelet toolbox. This toolbox includes many pre-defined wavelets, divided into families. For example, among others we have the Daubechies, the biorthogonal, the Coiflet and the Symmlet families (Mal-lat, 1998). Most functions require the desired wavelet in a family to be specified. The functions which involve wavelet transform computation also permit the specification of the filter bank coefficients.
dyaddown: Dyadic downsampling.
Input parameters:
The input vector or matrix x;
The integer evenodd; if evenodd is even, the output corresponds to the even samples of the input; if evenodd is odd, the output corresponds to the odd samples of the input;
The parameter 'type', when x is a matrix; if 'type'='c', only the rows are downsampled; if 'type'='r', only the columns are downsampled; if 'type'='m', both rows and columns are downsampled;
Output parameter: The vector or matrix y containing the downsampled signal.
Example:
x=[1.0 2.7 2.4 5.0]; evenodd=l;y=dyaddown(x,evenodd);
dyadup: Dyadic upsampling.
For a complete list of input and output parameters, see command dyadown.
Example:
x=[0.97 -2.1 ; 3.7 -0.03]; evenodd=0;y=dyadup(x,'m',evenodd);
qmf: Generates a quadrature mirror filter of the input.
Input parameters:
The input vector or matrix x;
The integer p. If p is even, the output corresponds to x in reversed order with the signs changed for the even index entries. If p is odd, the output corresponds to
